100872021 has 8 divisors (see below), whose sum is σ = 134817184. Its totient is φ = 67087440.

The previous prime is 100872017. The next prime is 100872073. The reversal of 100872021 is 120278001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 100872021 - 2² = 100872017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100872001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38671 + ... + 41196.

It is an arithmetic number, because the mean of its divisors is an integer number (16852148).

Almost surely, 2^100872021 is an apocalyptic number.

It is an amenable number.

100872021 is a deficient number, since it is larger than the sum of its proper divisors (33945163).

100872021 is an equidigital number, since it uses as much as digits as its factorization.

100872021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80291.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 100872021 is about 10043.5064096161. The cubic root of 100872021 is about 465.5041681628.

The spelling of 100872021 in words is "one hundred million, eight hundred seventy-two thousand, twenty-one".